Etsy Shop Review: The Vintage Pearl Hand Stamped Jewelry
https://www.edocr.com/v/476jmm5r/q2ujucy908/How-In-Order-To-A-Graduation-Charm-Bracelet
In short, the higher the karat, the much more costly the bracelet will just be. Someone who is edgier or more sporty might prefer like the cotton cord. And I'd express that charms are still symbolic.